Don't rely on a local sshd being running for a local test.

[tuexen]

Summary

tst.localtcpstate.ksh relies on an instance of sshd running on the local host, which might not be the case. In addition, using ssh has an impact on the TCP communication which is not intended. Therefore, use an instance of nc. This is similar to r286171 for tst.ipv4localtcp.ksh.